Abstract
It has been well accepted by mining researchers that coal tends to undergo abrupt fracture under the coupling effect of dynamic and static loads. Hence, the study of influence of coupled static and dynamic loads on coal failure behaviour is meaningful for the understanding of coal burst. In this paper, PFC modelling of SHPB test is adopted to investigate the fracture mode and energy evolution of Australian hard coal under different combinations of pre-stress levels and impact velocities. Results have shown that high dynamic load will make the fracture mode and energy release of coal samples more violent even the static load is low. Although the strain energy increases with pre-stress level, the kinetic energy remains on a low level with the increase of pre-stress level when the impact velocity is 4 m/s.
Highlights
It has been widely accepted by researchers that the occurrence of coal burst is induced by the superposition of dynamic and static loads
To coupled static and dynamic loads produced by split Hopkinson bar (SHPB) tests, to demonstrate the contribution of dynamic load to coal burst under different pre-stress level
By adopting the particle flow code (PFC) modelling of SHPB tests, this paper aims to study the failure behaviour and energy evolution of Australian hard coal under coupled static and dynamic loads
Summary
It has been widely accepted by researchers that the occurrence of coal burst is induced by the superposition of dynamic and static loads. The split Hopkinson bar (SHPB) system is a widely used high strain rate loading apparatus to determine the dynamic properties of geomaterials under complicated stress environments [1]. Many scholars adopted numerical modelling software to simulate the test process and results of SHPB test of geo-materials [2,3,4]. The PFC modelling is extended to simulate the failure process of coal subject to coupled static and dynamic loads produced by SHPB tests, to demonstrate the contribution of dynamic load to coal burst under different pre-stress level
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